Islam, M. Tazul, AND Ahmed, M. Jamaluddin. "A Simple Spectrophotometric Method for the Trace Determination of Zinc in Some Real, Environmental, Biological, Pharmaceutical, Milk and Soil Samples Using 5,7- Dibromo-8-hydroxyquinoline" Pakistan Journal of Analytical & Environmental Chemistry [Online], Volume 14 Number 1 (2 December 2013)